/*
 * Encog(tm) Core v3.0 - Java Version
 * http://www.heatonresearch.com/encog/
 * http://code.google.com/p/encog-java/
 
 * Copyright 2008-2011 Heaton Research, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *   
 * For more information on Heaton Research copyrights, licenses 
 * and trademarks visit:
 * http://www.heatonresearch.com/copyright
 */
package org.encog.neural.networks.training.pnn;

/**
 * Calculate criteria.
 *
 */
public interface CalculationCriteria {

	/**
	 * Calculate the error with a single sigma.
	 * @param sigma The sigma.
	 * @return The error.
	 */
	double calcErrorWithSingleSigma(double sigma);


	/**
	 * Calculate the error with multiple sigmas.
	 * @param x The data.
	 * @param direc The first derivative.
	 * @param deriv2 The 2nd derivatives.
	 * @param b Calculate the derivative.
	 * @return The error.
	 */
	double calcErrorWithMultipleSigma(double[] x, double[] direc,
			double[] deriv2, boolean b);
	
}
